WO2008023609A1 - Station de base, station mobile et procédé de sélection de cellule - Google Patents

Station de base, station mobile et procédé de sélection de cellule Download PDF

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Publication number
WO2008023609A1
WO2008023609A1 PCT/JP2007/065850 JP2007065850W WO2008023609A1 WO 2008023609 A1 WO2008023609 A1 WO 2008023609A1 JP 2007065850 W JP2007065850 W JP 2007065850W WO 2008023609 A1 WO2008023609 A1 WO 2008023609A1
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WO
WIPO (PCT)
Prior art keywords
cell
mobile station
preselected
selection
base station
Prior art date
Application number
PCT/JP2007/065850
Other languages
English (en)
Japanese (ja)
Inventor
Mikio Iwamura
Minami Ishii
Yasuhiro Kato
Sadayuki Abeta
Original Assignee
Ntt Docomo, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ntt Docomo, Inc. filed Critical Ntt Docomo, Inc.
Priority to BRPI0715618-9A priority Critical patent/BRPI0715618A2/pt
Priority to MX2009001567A priority patent/MX2009001567A/es
Priority to CN2007800306890A priority patent/CN101507332B/zh
Priority to US12/377,685 priority patent/US8155681B2/en
Priority to EP07792493.4A priority patent/EP2056609A4/fr
Priority to JP2008530868A priority patent/JP5069685B2/ja
Publication of WO2008023609A1 publication Critical patent/WO2008023609A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/08—Load balancing or load distribution
    • H04W28/09—Management thereof
    • H04W28/0925—Management thereof using policies
    • H04W28/0942—Management thereof using policies based on measured or predicted load of entities- or links
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/22—Performing reselection for specific purposes for handling the traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel

Definitions

  • Base station mobile station, and cell selection method
  • the present invention relates to an LTE (Long Term Evolution) system, and more particularly to a base station, a mobile station, and a cell selection method.
  • LTE Long Term Evolution
  • LTE Long Term Evolution
  • band indicates a frequency band in which the LTE system is operated, for example, 800 MHz band and 2 GHz band.
  • Carrier refers to the bandwidth of the system operating in each frequency band. LTE requires that 1.25 MHz, 2.5 MHz, 5 MHz, 10 MHz, 15 MHz, and 20 MHz can be supported! Being! /
  • a mobile station (UE: Uesr Equipment) (hereinafter referred to as “Band A capable UE”) capable of transmitting and receiving in band A exists.
  • Mobile stations (hereinafter referred to as “Band A + B capable UE”) capable of transmitting and receiving in A and B will exist.
  • Band A capable UE cannot transmit / receive in Band B even if Band B is installed.
  • Band A + B + C + D capable UEs having transmission / reception capabilities in the nodes KA, B, C, and D.
  • mobile stations operating in the same operator network such as Force S, multiple bands, multiple carriers, and having different transmission and reception capabilities coexist.
  • load distribution corresponding to transmission / reception capabilities of different mobile stations That is, load balancing is necessary. For example, when there are multiple bands or carriers, if a mobile station is biased to a certain band or a certain carrier, transmission / reception processing is performed on a concentrated carrier even though there are vacancies in other bands and carriers. As a result, communication quality deteriorates.
  • Load balancing includes traffic load balancing in which active users, i.e. users in communication, are evenly distributed, and camping load, in which idle users, i.e. users in standby, are evenly distributed. There is power of balancing (Camp load balancing).
  • Non-patent document 1 J. Laino, A. Wacker, and T. Novosaa, Radio Network Planning and Optimization for UMTS ", John Wiley & Sons, Chichester, 2002, p.229-231.
  • Non-Patent Document 2 T—Mobile, R2-060934, “Load sharing using cell reseection, TSG—RAN WG2 # 52, Athens, March 27—31, 2006 Disclosure of Invention
  • the present invention has been made to solve at least one of the above-mentioned problems, that is, the requirements, and its purpose is to reduce the overhead of broadcast information paging especially when operating multiple carriers. And the time to transition from idle to active It is an object of the present invention to provide a base station, a mobile station, and a cell selection method that can be reduced. Means for solving the problem
  • a base station of the present invention includes:
  • Load measuring means for measuring traffic conditions in each cell
  • a selection probability calculating means for calculating a selection probability for selecting a preselected cell to be accessed when the mobile station transitions from idle to active based on the traffic situation;
  • Control plane control means for performing line connection with the preselected cell accessed by the mobile station
  • One of the features is to have
  • the mobile station can be accessed to a cell different from the standby cell.
  • the base station operates a plurality of cells having a predetermined bandwidth, and selects a preselected cell to be accessed when the mobile station calculated based on the traffic situation in each cell transitions from idle to active. Notification of selection probability,
  • Cell selection means for selecting a preselected cell to be accessed when the own station transitions from idle to active based on the selection information
  • Control plane control means for setting up a line with the preselected cell selected by the cell selection means
  • One of the features is to have
  • the mobile station selects and accesses the cell to be accessed when the mobile station transitions from idle to active based on the selection probability broadcast from the base station. Can do.
  • the cell selection method of the present invention comprises:
  • the base station is connected to each cell of a plurality of cells having a predetermined bandwidth operated by the base station. Load measurement step for measuring the traffic situation;
  • a selection probability calculating step in which the base station calculates a selection probability for selecting a preselected cell to be accessed when the mobile station transitions from idle to active based on the traffic situation;
  • a cell selection step in which a mobile station selects the preselected cell based on the selection information
  • a mobile station accessing the preselected cell
  • One of the characteristics is that the mobile station and the preselected cell have a control plane control step for performing line connection.
  • the base station can cause the mobile station to access a cell different from the standby cell, and the mobile station is based on the selection probability broadcast from the base station.
  • the base station can cause the mobile station to access a cell different from the standby cell, and the mobile station is based on the selection probability broadcast from the base station.
  • the embodiment of the present invention it is possible to reduce broadcast information and paging overhead when operating a plurality of carriers, and it is possible to reduce time for transition from idle to active, as well as cell selection and cell selection.
  • the method can be realized.
  • FIG. 1 is an explanatory diagram showing an increase in bands in LTE.
  • FIG. 2 is an explanatory diagram showing cell types.
  • FIG. 3 is an explanatory diagram showing cells, cell sets, and cell layers.
  • FIG. 4 is a flowchart showing the operation of the mobile communication system according to one embodiment of the present invention.
  • FIG. 5 is an explanatory diagram showing a method for selecting a preselected cell according to an embodiment of the present invention.
  • FIG. 6 is an explanatory diagram showing an example of system information that can be applied to an embodiment of the present invention.
  • FIG. 7 is an explanatory diagram showing an example of system information that can be applied to an embodiment of the present invention.
  • FIG. 8 is an explanatory diagram showing an example of system information that can be applied to an embodiment of the present invention.
  • FIG. 9 is an explanatory diagram showing reselection in a mobile station according to one embodiment of the present invention.
  • FIG. 10 is a partial block diagram showing a base station according to an embodiment of the present invention.
  • FIG. 11 is a partial block diagram showing a mobile station that is effective in an embodiment of the present invention.
  • the mobile communication system which is particularly useful in the present embodiment includes a base station (eNB: eNode B) and a mobile station (UE).
  • eNB eNode B
  • UE mobile station
  • a plurality of carriers for example, a carrier of 20 MHz
  • 10MHz carrier, 5MHz carrier, etc. are operated by operators.
  • a licensed frequency band is operated by LTE.
  • the band indicates a frequency band in which the LTE system is operated, for example, 800 MHz band and 2 GHz band.
  • Carrier refers to the bandwidth of a system that operates in each frequency band.
  • LTE is required to be able to handle any of 1.25 MHz, 2.5 MHz, 5 MHz, 10 MHz, 15 MHz, and 20 MHz. ing.
  • the bandwidth of 1.25 MHz, 2.5 MHz, 5 MHz, 10 MHz, 15 MHz and 20 MHz is selected as the bandwidth of one carrier.
  • FIG. 2 shows an example in which a plurality of carriers are operated within one band.
  • 20 MHz, 10 MHz, 5 MHz, and 20 MHz are operated in one non-K.
  • a carrier is also called a cell.
  • a broadcast channel (BCH) that transmits broadcast information only in a certain carrier, for example, a carrier of 20 MHz, and a paging channel (PCH) that transmits paging are transmitted.
  • the information transmitted on the broadcast channel is limited to the minimum necessary information.
  • Necessary minimum information includes, for example, system frame number (system frame number), random access control information (dynamic persistence level for random access control), and the position of the carrier transmitting the broadcast channel and paging channel.
  • the dominant senor dominanto cell
  • subordinate senor subordinate senor
  • a set of cells included in the same band operated by the same base station is referred to as a cell set.
  • the cell set includes at least one dominant cell.
  • a cell set may include one or more subordinate cells.
  • eNBl there is one base station (eNBl).
  • band A has three carriers (cells), namely fAl, fA2 and fA3, and band B has two carriers, namely fBl and fB2.
  • the bandwidth of fAl, fA2, fA3, fBl and fB2 is 10MHz.
  • the bandwidth of fAl, fA2, fA3, fBl, and fB2 may be 5 MHz or 20 MHz.
  • fAl and fBl are dominant cells, and fA2, fA3, and fB2 are subordinate cells. Further, cells included in the same band A, that is, a set of fA1, fA2, and fA3, and cells included in the same band B, that is, a set of fBl and fB2, are cell sets.
  • the same operation is performed in at least one base station installed at a location different from base station eNBl, for example, eNB2, and a dominant cell, a subordinate cell, and a cell set are defined.
  • the same carrier set is called a cell layer.
  • the “senore layer” refers to cells having the same center frequency and bandwidth.
  • fAl, fA2, fA3, fBl and fB2 operated in eNBl and fAl, fA2, fA3, fBl and fB2 operated in eNB2 are called cell layers. .
  • the base station 100 operates when one dominant cell and a subordinate cell are operated.// The power described below is also applicable when a plurality of dominant cells and subordinate cells are operated. .
  • the dominant cell on which the mobile station 200 waits is selected as a standby cell
  • the mobile station 200 selects in advance based on the selection probability described later, a random access channel is transmitted, and initial access ( A dominant cell or subordinate cell that performs initial access) is called a pre-selected cell.
  • the preselected cell is also referred to as an accelerating cell.
  • the mobile station 200 may select a standby cell as a preselected cell based on the selection probability. In the present embodiment, a case where the standby cell and the preselected cell are different will be described.
  • the base station broadcasts the selection probability of the dominant cell and the subordinate cell (step S402).
  • the selection probability is reported only by the dominant cell.
  • the mobile station 200 performs standby in a standby cell.
  • the mobile station 200 receives the broadcast information transmitted from the standby cell power, and performs initial access according to the selection probability included in the broadcast information, that is, from among the dominant cell and subordinate cell as a preselected cell.
  • Select one cell That is, the mobile station 200 receives broadcast information broadcast from the standby cell and, based on the selection probability included in the broadcast information, separates the cell that is currently waiting and performs initial access.
  • Select pre-selected cell in advance. The cell that waits is selected from the dominant cell, and the initial access is selected from the dominant cell or the subordinate cell.
  • aGW access Gateway
  • MME control plane
  • UPE user plane
  • the MME calls the mobile station 200. Since the MME holds the information registered by the mobile station and knows which base station should be paged, it transmits the paging to that base station (step S408).
  • paging is transmitted to the standby cell power mobile station.
  • the standby cell transmits a paging indicator channel (step S410), and then transmits a paging channel (step S412).
  • the paging channel includes an international mobile subscriber identification ID / (or) mobile subscriber identification ID (IMSI / TMSI: international mobile subscriber identifier / temporary mobile subscriber identifier) Etc. are included.
  • the mobile station 200 determines whether or not its own global ID, that is, IM SI / TMSI, is included in the paging channel! In this case, the preselected cell is accessed by a random access channel (RACH) (step S414). While the mobile station 200 is idle, it selects a cell to access in advance! /, So it knows which cell to access! / ⁇ . That is, the preselected cell is accessed instead of the standby cell. In this case, if the preselected cell and the standby cell are different, the access is fied at a frequency different from that of the standby cell.
  • RACH random access channel
  • the subsequent line setting is performed between the mobile station 200 and the preselected cell.
  • the mobile station 200 transmits a random accelerator channel to the preselected cell.
  • RACH includes, for example, signature, CQI (Channel Quality Indicator), and purpose information.
  • the preselected cell sends a response to the RACH (RACH response) to the mobile station 20.
  • the RACH response includes, for example, signature, timing advance (TA: Timing Advance, C——RNTI (cell specific—Radio Network Temorary ID)), and UL grant information.
  • TA Timing Advance
  • C Cell specific—Radio Network Temorary ID
  • a connection request is transmitted in the uplink.
  • LTE Long Term Evolution
  • the base station 100 instructs a time frame, a frequency block, and an information amount as a UL grant.
  • a frequency block may be called a resource block, or may be called a resource unit in the uplink.
  • C—RNTI is an ID used in the RAN for identifying a mobile station.
  • Timing advance will be described.
  • the UL grant instructs the time frame and frequency block to be transmitted on the uplink shared channel, but the propagation delay differs depending on the location of the mobile station in the cell. There is a risk that the reception timing will be shifted and the time frame may be worn back and forth on the time axis. Therefore, it is necessary to adjust the transmission timing so that the reception timing is within a predetermined time frame. Information for adjusting the transmission timing is called timing advance. Timing advance is also used in GSM systems, for example.
  • connection request (Conn, requset: Connection requset) to the preselected cell (step S418).
  • connection request (Conn, requset: Connection requset) to the MME / UPE (step S420).
  • the MME / UPE performs line setting based on the connection request.
  • the MME / UPE sends a connection setup (Conn, setup: Connection setup) to the event selection seminar (step S422).
  • the preselected cell transmits a connection setup to the mobile station 200 (step S424).
  • connection setup complete Connection setup complete
  • steps S414 to S426 are merely examples, and may be changed as appropriate except that the cell receiving the paging and the cell performing the initial access may be different. It is possible.
  • step S424 from the base station to the mobile station may be performed without waiting for a response from the MME / UPE (step S422).
  • step S414 the processing after step S414 described above is performed. That is, when a transmission operation is performed on the mobile station 200, the mobile station 200 transmits RACH to the preselected cell.
  • Band A capable UE and Band A + B capable UE will be mixed.
  • Band A capable UE and Band A + B capable UE exist at a ratio of half
  • Band A capable UE selects, Band ⁇ , Band A + B capable
  • the UE selects Band A and Band 8 at a ratio of 50:50.
  • Band A and Band B are selected at 75:25, which is not preferable because they are biased toward Band A.
  • the selection probability is obtained based on the percentage of mobile stations that are in the yard. For example, if the ratio between Band A capable UE and Band A + B capable UE is 40%: 60% and load balancing is performed equally, the probability of selecting Band A is the probability of selecting Band A To Pr
  • Band A has two Senor Al and A2 having a bandwidth of 10 MHz, and Band
  • this selection probability is determined, it can be used for a predetermined period with the same parameters.
  • base station 100 calculates a load situation in each cell, for example, a load situation in a dominant cell and a subordinate cell, and calculates a selection probability based on the load situation. You may make it do. In fact, the load situation varies from cell to cell and from moment to moment. Based on the dynamic load variation, the selection probability is calculated.
  • the carriers (cells) of A, B, and C are operated in a certain band, the bandwidth power of Senore A 3 ⁇ 4 ⁇ ⁇ , the bandwidth power of cell OOMHz, the bandwidth of cell C
  • the width force is S5MHz.
  • LTE the minimum transmission / reception capability of a mobile station is set to 10 MHz.
  • LTE requires a system that can be applied to bandwidths of 1.25 MHz, 2.5 MHz, 5 MHz, 10 MHz, 15 MHz, and 20 MHz as the bandwidth of the senor. For example, if an operator obtains a 20MHz license, it will operate with a 20MHz bandwidth.
  • a mobile station having a transmission / reception capability of 10 MHz has no problem. Can communicate. However, in a cell operated with a bandwidth of 20 MHz, communication is performed using a part of the 20 MHz bandwidth.
  • carrier A for a mobile station having a transmission and reception capability of 20 MHz.
  • Carrier A is the busiest, that is, has the largest load, but the remaining amount of radio resources 4 can be used. Therefore, the highest throughput is achieved by using carrier A.
  • carrier C is the second largest remaining radio resource, so carrier C should be selected.
  • carrier B should be selected.
  • the remaining radio resource amount is 4 because it is operated with a bandwidth of 20 MHz. 2 Power, sometimes not usable. Therefore, in this case, the remaining radio resource of carrier A needs to be regarded as 2. Therefore, in this case, it is best to select carrier C whose remaining radio resources are 3. Next, the remaining radio resources are the second largest It is better to select carrier B because it is carrier B. Finally, carrier A should be selected.
  • the mobile station can select the optimum cell by informing the selection probability, the load status, and the bandwidth of each cell.
  • this corresponds to a case where a cell for transmitting an uplink signal for initial access is selected in advance to perform traffic load balancing.
  • the number of cell layers (Number of cell layers), the number of cell layer frequency codes (Cell layer frequency code number), the cell layer bandwidth (cell layer bandwidth), the selection probability (Selection (initial access) probabilit y) is notified.
  • the cell layer bandwidth need not be notified when all layers have the same bandwidth. Moreover, you may make it notify a load level instead of a selection probability.
  • Band indicator Band selection prob ability, Number of cell layers, Cell layer frequency code number, Cell layerer 3 ⁇ 41 ⁇ 2— ⁇ (cell layer band width)
  • the selection probability Selection (initial access) probability
  • the number of cell layers is the number of cell layers included in each band.
  • Band A contains Senore Al
  • Band B contains cells B1 and B2, and the dominant cell is cell A1.
  • And B1, and the subordinate cell is cell A2, A3, and B2, camping load balancing must be performed between Senore A1 and Cell B1, and cells Al, A2, A3, B1 And traffic load balancing between B2 and B2.
  • the number of bands, the band indicator, the band selection probability, and the number of dominant cell layers (Number of dominant cells). layers), cell layer frequency code number, cell layer bandwidth bandwidth, selection probability of standby senor (Selection (camping) probability), preselection cell candidate Selection probability (Selection (initial access) proba bility, Number of subordinate cell layers (Number of subordinate cell layers), Cell layer frequency code number (Cell layer frequency code number), Cell layer bandwidth (Cell layer bandwidth), The selection probability (Selection (initial acce ss) probability) is passed.
  • the mobile station selects a standby cell. However, as the mobile station moves, the cell waiting for another cell is changed.
  • a standby cell is a cell that receives a paging channel in that cell, that is, a cell that receives paging.
  • the process in which the mobile station selects a standby cell is called cell selection (cell selection), and the process in which the mobile station reselects the standby cell while moving is called cell reselection (reselection).
  • the propagation status changes instantaneously, it is best to efficiently listen to the cell with the best propagation status. However, if this is done, reselection will occur frequently, resulting in an extra battery. Terry is consumed.
  • the threshold of S—criteria is used and the pilot signal is received from the base station that covers V, and the pilot signal reception level power is not reselected until it falls below S criteria. can do.
  • each base station there are a base station (eNBl) lOO and a base station (eNB2) 100, and each base station
  • the mobile station 200 waits for a dominant cell indicated by a thick broken line. Also, the mobile station 200 sets a subordinate cell indicated by a thin broken line as a preselected cell based on the selection probability (1).
  • the mobile station 200 moves and the reception quality of the preselected cell becomes a predetermined threshold value, for example, S-crite ria or less, and if the reception quality further deteriorates, the propagation state becomes bad and the initial access cannot be performed ( 2).
  • a predetermined threshold value for example, S-crite ria or less
  • it is set as a pre-selected cell among the subordinate cells !, Nare, and reselected to another subordinate cell.
  • reselection may be made to the dominant cell.
  • the mobile station 200 moves further, and the reception quality of the standby cell becomes equal to or lower than a predetermined threshold, for example, S-criteria (3).
  • a predetermined threshold for example, S-criteria (3).
  • the mobile station 200 measures the reception quality of the neighboring cells, and transitions to a base station that covers the cell having the best reception quality, for example, the base station (eNB2) 100. That is, based on the standby cell
  • Ground station (eNB2) Change to 100 dominant cells.
  • the mobile station 200 changes the preselected cell in accordance with the change of the standby cell.
  • the preselected cell is selected based on the broadcast information of the base station 100 power. Also
  • the cell layer when the cell layer configuration is the same as that of the transition source cell, the cell layer may be switched to the same cell layer. That is, if the center frequency and bandwidth do not change, cells belonging to the same cell layer are reselected as preselected cells. In this case, the selection probability may change. By doing so, the process of measuring and reselecting the preselected cell, that is, the process of scanning the frequency can be omitted. [0091] When the standby cell is changed, reselection may be performed based on the selection probability included in the notification information transmitted from the transition destination base station. By doing so, it is possible to prevent the preselected cell from being biased toward a dominant cell or a subordinate cell having a good propagation state.
  • the threshold of reception quality may be the same or different in the standby cell and the preselected cell.
  • a layer-specific threshold value may be set when different values are used.
  • a threshold for a standby cell is set, an offset is set for a preselected cell based on the measured propagation state, and a determination is made based on the threshold value and a value obtained from the offset. Good.
  • the base station operates cells fAl, fA2, and fA3 in band A.
  • the base station operates multiple bands, a plurality of bands are provided in each band.
  • cell fAl is called a dominant cell
  • cells fA2 and fA3 are called subordinate cells.
  • Base station 100 includes transmission / reception sharing section 102 having an antenna, dominant cell processing section 104, subordinate processing sections 120 and 128, selection probability calculation section 130, control plane processing section 132, network interface 134.
  • the dominant cell processing unit 104 includes an RF circuit 106, a user plane processing unit 108, a load measurement unit 110, a paging channel generation unit 109, and a broadband channel generation unit 112.
  • the subordinate cell processing units 120 and 128 include RF circuits 114 and 122, user plane processing units 116 and 124, and load measurement units 118 and 126.
  • Dominant cell processing section 104 performs processing related to a standby cell on which mobile station 200 stands by and processing related to a preselected cell selected by mobile station 200 according to the selection probability.
  • Subordinate cell processing sections 120 and 128 perform processing related to a preselected cell selected by mobile station 200 according to the selection probability.
  • the user plane processing units 108, 116, and 124 instruct the load measurement units 110, 118, and 126 to perform load measurement at predetermined intervals, respectively.
  • Load measuring sections 110, 118, and 126 perform load measurement in accordance with instructions from user plane processing sections 108, 116, and 124, and input the results (load status) to selection probability calculating section 130.
  • the selection probability calculation unit 130 calculates the selection probability by the method described above based on the load status input by the load measurement units 110, 118, and 126 and inputs the selection probability to the broadcast channel generation unit 112.
  • Broadcast channel generating section 112 generates a broadcast channel including the input selection probability and inputs it to RF circuit 106.
  • the RF circuit 106 transmits the input broadcast channel via the shared transmission / reception unit 102.
  • the paging channel generation unit 109 generates a paging indicator channel and a paging channel and inputs them to the RF circuit 106.
  • the RF circuit 106 transmits the input paging indicator channel and paging channel via the transmission / reception sharing unit 102.
  • the RACH transmitted from the mobile station 200 depends on the RF circuit 106 of the dominant senor processing unit 104, the RF circuit 114 of the subordinate cell processing unit 120, or the subordinate depending on the cell selected as the preselected cell.
  • the signal is input to the control plane processing unit 132 via one of the RF circuits 122 of the cell processing unit 128.
  • Control plane control section 132 performs RRC (Radio Resource Control) and MAC (Medium Access Control) processing. Specifically, the processing related to step S416, step S420, and step S424 described with reference to FIG. 4, for example, C—RNTI is assigned to the mobile station, TA and UL grant are specified, and the connection request is MME / U. Sends to PE and sends connection setup to mobile station 200.
  • RRC Radio Resource Control
  • MAC Medium Access Control
  • the data transmitted from mobile station 200 is received by the preselected cell for which the connection has been set. For example, when a cell in which the carrier frequency fA2 is operated is selected as a preselected cell, data transmitted from the mobile station 200 is received by the RF circuit 114 via the transmission / reception sharing unit 102, and the user plane processing unit 116 is input.
  • the user plane processing unit 116 performs processing related to user data. For example, the reception data is transmitted to the receiving mobile station (external) via the network interface 134. Also, for example, user data buffering, segmentation, reassembly, encoding, decoding, retransmission processing, packet discard processing, flow control, etc. are performed.
  • the mobile station 200 includes an RF circuit 202, a broadcast channel reception unit 204, a control plane processing unit 206, a user plane processing unit 208, a user I / F 210, a reception quality measurement unit 212, A cell selection unit 222, a mobile station capability storage unit 224, a selected cell storage unit 226, a threshold value determination unit 218, and a control unit 220 are provided.
  • the reception quality measurement unit 212 includes a standby cell reception quality measurement unit 214 and a preselected cell reception quality measurement unit 216.
  • the broadcast channel including the selection probability transmitted from the base station 100 is input to the broadcast channel reception unit 204 via the RF circuit 202.
  • Broadcast channel receiving section 204 extracts selection probabilities included in the broadcast channel and inputs them to cell selection section 222.
  • the cell selection unit 222 selects a preselected cell based on the selection probability.
  • the preselected cell may be selected with reference to the mobile station capability storage unit 224 in which the capability of the own station is stored.
  • the broadcast channel transmitted from the base station 100 is notified of the bandwidth (bandwidth) supported by each cell, as described above, the broadcast channel is based on the bandwidth supported by each cell. You can select it! /
  • the cell selection unit 222 may select a preselected cell based on a service. For example, when receiving MBMS (Multimedia Broadcast / Multicast Service), it belongs to the cell in which MBMS is transmitted or the band that includes the cell. Other cells to be selected are selected as preselected cells. For example, in the camped cell FAL, if when M BMS is being performed the service by fB2, the cell selection unit 222, which receives the MBMS, and Interview wishes to receive in parallel the two cast service, f A 2 When f A3 is selected, it is difficult to receive MBMS with fB2. Therefore, select fBl or use fB2 to receive the Unicast service among MB MS carriers.
  • MBMS Multimedia Broadcast / Multicast Service
  • VoIP Voice over Internet Protocol
  • users may be consolidated into the same band / carrier.
  • VoIP requires low latency and has a low transmission rate.
  • a flexible service that is, a service that can maintain a service even if there is some delay, such as web browsing and file download, and an inflexible service such as VoIP and streaming are balanced across all carriers. You may make it allocate as follows.
  • a premium user may be allowed to select a cell with good coverage.
  • the cell operating in the 800 MHz band will generally improve the propagation state between the cell operating in the 2 GHz band and the cell operating in the 800 MHz band. Therefore, let the premium user select a cell operating in the 800MHz band as a pre-selected cell.
  • the cell selection unit 222 may select a preselected cell based on a traffic load. For example, as described above, a preselected cell is selected based on the remaining resource amount and transmission power. Further, for example, a preselected cell is selected based on the traffic load for each service type described above.
  • the cell selection unit 222 may select a preselected cell based on the moving speed of the mobile station 200. For example, for a mobile station moving at high speed, a cell with a small cell number and a large cell radius and a large coverage is set as a preselected cell. On the other hand, if the mobile station is moving at a low speed, a layer with a small cell radius and a large number of cells is set as a preselected cell.
  • the cell selection unit 222 explains information related to the preselected cell, for example, referring to FIG. 6 to FIG.
  • the stored information is stored in the selected cell storage unit 226.
  • the selected cell storage unit 226 also stores information related to the standby cell.
  • control unit 220 Based on the information stored in the selected cell storage unit 226, the control unit 220 sets a frequency and the like. In addition, if it is necessary to reselect the standby cell and / or the preselected cell based on the determination result of the threshold determination unit 218, the reception quality measurement unit 212 executes another cell search and measures the other cell. To control. Furthermore, control is performed so that the cell selection unit 222 executes reselection.
  • the broadcast channel receiving unit 204 inputs information other than the selection probability to the control plane control unit 206. Based on the input information, the control plane control unit 206 performs a process of transmitting a response to the paging channel, that is, RACH, to the preselected cell via the RF circuit 202. After that, as described above, the line is set up with the preselected cell.
  • the control plane control unit 206 performs a process of transmitting a response to the paging channel, that is, RACH, to the preselected cell via the RF circuit 202. After that, as described above, the line is set up with the preselected cell.
  • the user plane control unit 208 performs processing according to the control plane control unit 206 and transmits transmission data via the RF circuit 202. Also, the received data is received via the RF circuit 202.
  • Reception quality measuring section 212 periodically measures the reception quality of the cell, and inputs the reception quality information to threshold determination section 218. More specifically, the reception quality of the standby cell is measured by the standby cell reception quality measurement unit 214, and the reception quality of the preselected cell is measured by the preselection cell reception quality measurement unit 216. When specified by the control unit 220, another cell search is performed and other cells are measured. The measurement result is passed to the cell selection unit 222 to provide cell selection / reselection material.
  • the threshold value determination unit 218 compares the input reception quality with a preset threshold value, for example, S-crite ria, and determines whether or not the input reception quality is equal to or less than the threshold value.
  • the threshold value determination unit 218 notifies the control unit 220 when the input reception quality falls below the threshold value.
  • the control unit 220 newly selects another cell having a higher reception quality. Specify in a cell.
  • the reception quality of the standby cell falls below the threshold value, among the other dominant cells, a dominant cell with a good reception quality is newly received. Specified as the default cell. Specifically, a command for changing the frequency is input to the RF circuit 202 to perform a peripheral cell search.
  • the RF circuit 202 changes the frequency.
  • Reception quality measuring section 212 measures the reception quality of neighboring cells and inputs it to cell selection section 222.
  • the cell selection unit 222 selects a standby cell based on the selection probability and the reception quality, and inputs information related to the standby cell to the selected cell storage unit 226.
  • the control unit 220 sets the frequency for the RF circuit 202 according to the information about the standby cell stored in the selected cell storage unit 226, and specifies the bandwidth to the control plane processing unit 206. Do.
  • the mobile station since the mobile station can select a preselected cell for initial access based on the selection probability notified from the base station, it limits the number of standby cells when operating multiple carriers. However, the delay in transitioning from idle to active can be reduced. Since the number of standby cells can be limited, broadcast information and paging overhead can be reduced.
  • the base station, mobile station, and cell selection method according to the present invention can be applied to a radio communication system.

Abstract

Une station de base exploite une pluralité de cellules ayant chacune une bande passante prédéterminée et calcule en fonction de l'état de trafic de chaque cellule une probabilité de sélection utilisée pour sélectionner une cellule de présélection à laquelle accède une station mobile lorsqu'elle passe de l'état de repos à l'état actif. La station mobile comprend un moyen servant à sélectionner la cellule de présélection à laquelle elle accède en fonction de l'information de sélection lorsqu'elle passe de l'état de repos à l'état actif, ainsi qu'un moyen servant à établir une ligne connectée à la cellule de présélection sélectionnée par le moyen de sélection de cellule.
PCT/JP2007/065850 2006-08-22 2007-08-14 Station de base, station mobile et procédé de sélection de cellule WO2008023609A1 (fr)

Priority Applications (6)

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BRPI0715618-9A BRPI0715618A2 (pt) 2006-08-22 2007-08-14 estaÇço base, estaÇço màvel e mÉtodo de determinaÇço de cÉlula
MX2009001567A MX2009001567A (es) 2006-08-22 2007-08-14 Estacion base, estacion movil y metodo de determinacion de celda.
CN2007800306890A CN101507332B (zh) 2006-08-22 2007-08-14 基站及移动台以及小区选择方法
US12/377,685 US8155681B2 (en) 2006-08-22 2007-08-14 Base station, mobile station, and cell determination method
EP07792493.4A EP2056609A4 (fr) 2006-08-22 2007-08-14 Station de base, station mobile et procédé de sélection de cellule
JP2008530868A JP5069685B2 (ja) 2006-08-22 2007-08-14 基地局および移動局並びにセル選択方法

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JP2006225920 2006-08-22
JP2006-225920 2006-08-22

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JP (1) JP5069685B2 (fr)
KR (1) KR20090045242A (fr)
CN (1) CN101507332B (fr)
BR (1) BRPI0715618A2 (fr)
MX (1) MX2009001567A (fr)
RU (1) RU2009108209A (fr)
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EP2056609A1 (fr) 2009-05-06
RU2009108209A (ru) 2010-09-27
KR20090045242A (ko) 2009-05-07
TW200816844A (en) 2008-04-01
EP2056609A4 (fr) 2014-04-09
MX2009001567A (es) 2009-04-16
US20100291956A1 (en) 2010-11-18
BRPI0715618A2 (pt) 2013-06-25
JP5069685B2 (ja) 2012-11-07
JPWO2008023609A1 (ja) 2010-01-07
CN101507332B (zh) 2012-03-14
US8155681B2 (en) 2012-04-10
CN101507332A (zh) 2009-08-12

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